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The Advanced Geometric Formulae
by Nan Zhang
How to use the applet:
Please click either of the buttons to choose a topic to start the applet. Then you can draw lines or points on the axis following the instruction shown on the applet. The equations of lines and the coordinate of points will be displayed, and at last, the result of calculation will be shown on the applet. A very good point of this applet is that the user can draw on axis comfortablely.
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2002
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